GeneralHold S---------------------------- Change the size of your brush moving the mouse or stylusHold Z---------------------------- Set the drawing smoothnessHold D--------------------------- Change the color opacity of your brush moving the mouse or stylus

EraserHit E---------------------------------- Switch between the eraser/brushHold E--------------------------- Erase with the current brush. Simply pressing and releasing will still activate the simple eraser and pressing again will get you back to your brush. That means that you can now erase with any brush you like!

Color PickerHold Alt ------------------------ Quickly pick a color (This works only when using the solid color mode)